Volkswagen Q&A

2012 Volkswagen Passat Question: Why does the engine cut out [stall] if I choose the wrong gear

I have recently bought a diesel 2.0 bluemotion Passat.It is my first diesel and first 6 gear car. While it is a great drive, I have TWICE stalled it while driving on main roads while changing gear. Both times, I have managed to pull in to the side but am concerned if this happened on a motorway. The car is under warranty but I bought it privately and am reluctant to take it to a VW garage yet [I will contact the previous owner] The manual does not mention this problem